Welcome to the community, @Kenton_Smith!
Unfortunately, Airtable charges you for the workspace, so you would have to pay for any collaborators who have greater than “read-only access” to any base in your workspace.
Airtable doesn’t know the difference between “paid users” and “free users” — it only knows the difference between “paid workspaces” and “free workspaces”.
What this means is that Airtable is often collecting money multiple times over for a single person.
For example, I am a professional Airtable consultant with dozens of clients who are currently sharing their bases/workspaces with me. Each one of those clients is paying a monthly fee for me. So even though I am only one person, Airtable is collecting 100+ monthly fees for me.